VT-X option not available in BIOS even if Intel Core supports VT-X

You can only use VT-x if both CPU and motherboard support it. A motherboard that doesn't support VT-x is sadly quite common for laptops.

Things you can try:

• If you didn't do so already, check if VT-x isn't enabled already. Just because there's no option in the BIOS doesn't mean it's not enabled by default.

• Visit Acer | Downloads, choose your notebook model or enter your serial number or SNID and search for a BIOS update.

  You should find you SNID on a sticker below your laptop:

  

  If that sticker got lost or became unreadable, you can use this tool (Windows only) to auto-detect your serial number.